Nobody said people on basic income have to do nothing. One of the big wins of basic income is it frees people up to do whatever they find fulfilling. This could be working the same job you have today. This could be going to school so you can do more than just flip burgers. Or maybe becoming an artist, or a musician, or whatever else you may be passionate about.

It's also worth pointing out that Basic Income certainly won't give people a very comfortable life, so they'll still want some form of additional income. But maybe they don't have to work two jobs to feed their family anymore.